This is Atlas Copco part number 9232121880 O-RING, stocked at Crowder Supply as AC-9232121880. It seals a pressure joint inside the tool, and because elastomer takes a set long before the metal around it wears, it is one of the first items to replace when a machine starts weeping air or oil.

If you are working from a machine rather than a part number, start at the parts diagram library, or send us the model and serial and we will match it. Machines themselves are on the Atlas Copco lineup. Stocked in Denver orders placed by 4 PM ET ship the same day when the part is on the shelf.

• Part number: 9232121880
• Manufacturer: Atlas Copco
• Crowder SKU: AC-9232121880